{"product_id":"lunt-ls40tha-h-alpha-solar-telescope-premium-plus-kit","title":"Lunt LS40THa H-Alpha Solar Telescope - Premium PLUS Kit","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e40mm Dedicated H-Alpha Solar Telescope\u003c\/li\u003e\n\u003cli\u003eInternal Double-Stack System with ≤0.35Å Bandpass\u003c\/li\u003e\n\u003cli\u003eB600 Blocking Filter for Full-Disk Views \u0026amp; Imaging\u003c\/li\u003e\n\u003cli\u003eIncludes Lunt 7.2mm - 21.5mm Zoom Eyepiece\u003c\/li\u003e\n\u003cli\u003e1:1 Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eIntegrated SunLock Solar Finder\u003c\/li\u003e\n\u003cli\u003e4\" Vixen-Style Dovetail Rail\u003c\/li\u003e\n\u003cli\u003eIncludes Aluminum Hard Case with Custom Foam\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eThe Ultimate View of Solar Surface Detail in a 40mm Telescope\u003c\/h2\u003e\n\u003cp\u003eThe Lunt LS40THa H-Alpha Solar Telescope - Premium PLUS Kit is a complete, dedicated system designed to reveal the sun's dynamic chromosphere with the highest contrast possible in this aperture. By including a matched double-stack etalon filter, this kit narrows the bandpass to ≤0.35Å, transforming faint surface texture and active regions into a richly detailed, three-dimensional spectacle. It is the definitive choice for the observer who prioritizes surface contrast over all else in a portable, grab-and-go package.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMatched 40mm f\/10 Optics\u003c\/h3\u003e\n\u003cp\u003eThe foundation of the LS40THa is a 40mm f\/10 singlet objective lens, fully corrected for the 656.28nm hydrogen-alpha wavelength. This focal ratio provides a manageable 400mm focal length, creating a forgiving system for focus and tuning. The optical design ensures a high-contrast image is delivered to the etalon filtering system, a critical first step for high-resolution solar viewing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePrimary Tilt-Tuned Etalon Filter\u003c\/h3\u003e\n\u003cp\u003eThe heart of the telescope is its internal, front-mounted etalon. This precision filter uses a polished Fabry-Pérot cavity to isolate the light from hydrogen plasma, revealing the sun's chromosphere. The user tunes the filter to the precise H-alpha line by tilting the etalon with a simple thumbwheel, allowing you to shift the view slightly off-band to emphasize Doppler-shifted features like erupting prominences moving toward or away from you.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eLS40FHa Double-Stack Etalon for Maximum Contrast\u003c\/h3\u003e\n\u003cp\u003eThis Premium PLUS kit includes the crucial LS40FHa front-mounted double-stack etalon. Adding this second filter dramatically narrows the system's bandpass from the standard ~0.55Å to a very tight ≤0.35Å. This reduction in out-of-band light significantly increases the contrast of surface features, causing solar flares, filaments, and active region plage to stand out against the solar disk with stark definition. While a single-stack system shows you these features exist, the double-stack renders them with photographic-like texture.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eB600 Blocking Filter for Full-Disk Views\u003c\/h3\u003e\n\u003cp\u003eThe B600 blocking filter, housed in the star diagonal, is the final stage of the safety system and is sized to provide an unvignetted view of the entire solar disk with the included zoom eyepiece. This larger 6mm filter provides more clearance than the smaller B500, making it a better choice for observers who may want to try basic imaging of the full sun with a small sensor camera. It ensures the entire solar limb is visible at once, so you never miss a prominence erupting at the edge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Experience of High-Contrast Chromosphere Viewing\u003c\/h3\u003e\n\u003cp\u003eWith the double-stack engaged and the zoom eyepiece set to around 12mm, the experience is unlike any white-light view. After tuning the etalon, the solar surface resolves into a tapestry of texture. You can trace the dark, serpentine path of a filament as it snakes across an active region, then watch as its delicate structure appears to float just above the brighter background. This is the view that turns a static star into a living, dynamic object, and the ≤0.35Å bandpass is what makes it possible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUpgraded Focuser and SunLock Finder\u003c\/h3\u003e\n\u003cp\u003eThe Premium PLUS kit features an upgraded 1:1 Rack \u0026amp; Pinion focuser, which offers a smoother feel and better stability for holding cameras compared to the standard helical focuser. Finding the sun is made safe and simple by the integrated SunLock finderscope, a small pinhole that projects an image of the solar disk onto a tiny internal screen. When the dot is centered, the sun is in your eyepiece, eliminating any guesswork or unsafe alignment attempts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eLunt Zoom Eyepiece and Hard Case\u003c\/h3\u003e\n\u003cp\u003eCompleting the kit is the Lunt 7.2mm - 21.5mm zoom eyepiece, the ideal companion for a solar telescope. It allows you to frame the entire solar disk at 21.5mm (18.6x magnification), then zoom in to 7.2mm (55.5x) to scrutinize a specific sunspot group or prominence without ever taking your eye from the view. The entire system, including the double-stack filter, packs into a custom-cut foam-lined aluminum hard case for secure transport and storage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Note on Aperture and Seeing\u003c\/h3\u003e\n\u003cp\u003eWhile larger solar telescopes exist, the 40mm aperture is often an advantage under typical daytime seeing conditions. Atmospheric turbulence can easily degrade the view in larger scopes, but the LS40THa is less susceptible to these effects, frequently delivering a sharper, more stable image than a larger instrument on an average day. This makes it a highly effective and frustration-free grab-and-go solar telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Premium PLUS (double-stack) kit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Premium PLUS kit includes a second etalon filter that narrows the bandpass to ≤0.35Å. This dramatically increases the contrast of features on the sun's surface, like filaments and active regions, making them appear much more detailed and defined compared to the single-stack version.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this Lunt solar telescope safe to use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Lunt LS40THa is a dedicated solar telescope with multiple, permanently installed filters. As long as it is used as designed and is not modified, it is completely safe for direct solar observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use my own eyepieces with the LS40THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, you can use any standard 1.25\" eyepiece. However, non-solar-specific eyepieces may have coatings that produce reflections or glare (ghosting) when viewing the extremely bright sun. The included Lunt zoom eyepiece is optimized for this application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 40mm Lunt compare to the 50mm Lunt telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Lunt LS50THa offers 25% more aperture, providing slightly higher resolution on fine surface details under good seeing conditions. The LS40THa is smaller, lighter, and often performs better under average or poor seeing, making it a more consistent and portable option.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does this telescope use tilt-tuning instead of pressure-tuning?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTilt-tuning the front etalon is a simpler and more cost-effective mechanism for a telescope of this size, allowing Lunt to deliver high-quality etalon performance at an accessible price point. Lunt's larger telescopes use pressure-tuning for more uniform control over the filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I do astrophotography with the Lunt LS40THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, you can perform basic solar imaging with the LS40THa. It is suitable for capturing full-disk images or close-ups of large features using a small, lightweight planetary-style CMOS camera. Achieving focus may require a 1.25\" eyepiece extender.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003eSingle Stack: \u0026lt;0.55Å, Double Stack: ≤0.35Å\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd\u003eTilt-Tuned Etalon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Filter\u003c\/td\u003e\n\u003ctd\u003eB600 (6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e1:1 Rack \u0026amp; Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003e4\" Vixen-Style Dovetail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3.1 lbs (1.4 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLS40THa 40mm H-alpha Telescope\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLS40FHa Double-Stack Etalon Filter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eB600 Blocking Filter in Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1:1 Rack \u0026amp; Pinion Focuser\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLunt 7.2mm - 21.5mm Zoom Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eIntegrated SunLock Solar Finder\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e4\" Vixen-Style Dovetail Rail\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAluminum Hard Case with Custom Foam\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/luntsolarsystems.com\/wp-content\/uploads\/2022\/10\/40mm_Instructions_2022.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/luntsolarsystems.com\/product-registration-and-warranty\/\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":51221379744029,"sku":"LSS-LS40THa-Premium","price":2513.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-LS40THa-Premium-PLUS-Kit.jpg?v=1777426717","url":"https:\/\/davidastro.com\/fr\/products\/lunt-ls40tha-h-alpha-solar-telescope-premium-plus-kit","provider":"David Astro","version":"1.0","type":"link"}